AROMADENDRIN FROM EUCALYPTUS KINOS. 137 
ance of small scales, and separates in particles, while Aromadendrin 
has the appearance of flakes of matted material. This difference 
in appearance is very marked. 
CoLour Reactions ETC. OF AROMADENDRIN. 
When the dry substance is treated with concentrated sulphuric 
acid, the solution becomes of a fine yellow colour which fades and 
darkens on standing some time, thus differing entirely in this 
reaction from ‘‘eudesmin” which gives a purple colour under like 
conditions, 
With nitric acid it gives a fine crimson colour, thus differing 
from “ eudesmin ” which gives a yellow colour with this reagent. 
Potash gives a fine yellow colour. 
When dissolved in the smallest quantity of glacial acetic acid, 
and water added, nothing is precipitated, but after some time 
hair-like tufts of radiating crystals form. This is also a character- 
istic reaction differing from ‘‘eudesmin”; because, when “ eudes- 
min” is dissolved in the smallest quantity of glacial acetic acid 
and water added, the first drop causes turbidity; if now enough 
water be added to cause the whole to remain turbid, beautiful 
crystals soon form, the turbidity disappearing and the whole 
becomes crystallized. This is an easy method whereby to obtain 
“eudesmin ” crystallized in well shaped and fair sized crystals. 
The melting point of Aromadendrin was found to be 216° C. 
(uncorrected) on the surface of mercury; the previous melting 
point was evidently taken on impure material, and not free from 
“eudesmin.” Chloroform does not dissolve Aromaderidrin but it 
readily dissolves ‘“ eudesmin.” 
If these reactions are tabulated the differences are brought out 
more distinctly : 
| Eudesmin. ~ Aromadendrin. 
280, 'Dissolves dark, after a | Dissolves yellow, becomes 
(Concentrated) short time becomes pur- | dark and fades on long 
ple on edges and after | standing. On 
an 
tens _ purple liquid. 
